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Plumbing Pipe Size Calculator

Find the perfect pipe size for your plumbing system with our Plumbing Pipe Size Calculator! Instantly calculate flow rate, ideal pipe diameter, and fixture unit recommendations for efficient water flow and optimal performance. Whether you're a plumber, engineer, or DIY enthusiast, get fast, accurate results with real-time updates, intuitive design, and smart visuals!

Plumbing Pipe Size Calculator

Flow Rate Calculation
Pipe Sizing
Summary
Flow Rate (GPM) = (Velocity (ft/s) × Cross-Sectional Area (ft²)) × 7.48

Flow Rate Calculation

ParameterValue
Pipe Sizing based on Flow Rate + Pressure Drop & Fixture Unit Guidance

Pipe Sizing

Enter either your targeted flow rate or fixture units to get a recommended pipe diameter.

ParameterRecommended
Summary: Flow Rate, Pipe Diameter, & More

Summary

ParameterValue

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